
package com.bstek.urule.console.servlet;

import org.apache.commons.io.IOUtils;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * @author Jacky.gao
 * @since 2016年6月6日
 */
public class ResourceLoaderServletHandler implements ServletHandler, ApplicationContextAware {
    public static final String URL = "/res";
    private ApplicationContext applicationContext;

    @Override
    public void execute(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String path = req.getContextPath() + URuleServlet.URL + URL;
        String uri = req.getRequestURI();
        String resPath = uri.substring(path.length() + 1);
        String p = "classpath:" + resPath;
        if (p.endsWith(".js")) {
            resp.setContentType("text/javascript");
        } else if (p.endsWith(".css")) {
            resp.setContentType("text/css");
        } else if (p.endsWith(".png")) {
            resp.setContentType("image/png");
        } else if (p.endsWith(".jpg")) {
            resp.setContentType("image/jpeg");
        } else {
            resp.setContentType("application/octet-stream");
        }
        InputStream input = applicationContext.getResource(p).getInputStream();
        OutputStream output = resp.getOutputStream();
        try {
            IOUtils.copy(input, output);
        } finally {
            if (input != null) {
                input.close();
            }
            if (output != null) {
                output.flush();
                output.close();
            }
        }
    }

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    @Override
    public String url() {
        return URL;
    }
}
